talking book vs audio recording

talking book and audio recording both are nouns.

Word	Noun	Adjective	Verb	Adverb
talking book	Yes	No	No	No
audio recording	Yes	No	No	No

As nouns, audio recording is a hypernym of talking book; that is, audio recording is a word with a broader meaning than talking book:

talking book: sound recording of someone reading a book; frequently used by blind people
audio recording: a recording of acoustic signals

Other hypernyms of talking book include audio, sound recording.

talking book (noun)	audio recording (noun)
sound recording of someone reading a book; frequently used by blind people	a recording of acoustic signals